Rotating Solid Cube Using VB.NET and GDI+

In my last tutorial I have shown how to make a wireframe cube using VB.NET and GDI+. Today, we will build from the code from the last tutorial in order to make a rotating solid cube. The video below shows what we will achieve after finishing the tutorial.

The Code

The original code was divided in 2 files [Point3D.vb and Main.vb]. The Point3D.vb file defined the Point3D class which represents points in 3D space. The file Main.vb defined the Window form where the simulation runs.

The code is pretty much self-explanatory. Below I will just list the key changes.

In the Load event I enable double buffering. This is fundamental to eliminate flickering in the animation. Try to remove the first 2 lines of code, and run the application. You will certainly see the flickering that results.

Basically I have changed the code to draw filled faces instead of lines. However, now we must make sure to draw distant faces first, and closer ones last (Painters Algorithm).

Conclusion

As I have promised in the last tutorial, today I have shown how to make a rotating solid cube. In my next VB.NET tutorial, I will show you how to make a cool game in pretty simple steps.If you liked this article, please consider leaving a comment, or sharing this post using one of the buttons below, or even subscribing to the blog.

hello again lefam, im sorry that i didnt post anything up to now, i was really busy because i got a new job just a few weeks ago =3
well, i didnt spent too much time on this but i got some strange results xd, let me explain it (and please forgive my bad english, its not my native language)
i always like to know how things work, so i keep “discovering the circle again” over and over on diferent things that i see
some years ago i was playing with some equations and i wondered how they would look like on a 3D space, and made myself a rough but extremely precise (and slow) 3D drawing software, based on explicit 3 var functions, painting one dot at a time xd
i made some changes and painted some beatiful functions (adding colors based on the function itself makes them alive) but my software had some trouble, it was only capable of “looking” from one angle, so i wanted to rotate the functions, but i got some personal issues and droped the proyect before i could design an algorith to do so
a week ago i was surfing the net looking how to manage built in drawing functions from vb.net (because it doesnt let me know the hDC of the form anymore <.<) and found your example, it reminded me of that project and i remade it (for some reason it was really easy this time xd) and added 2 rows from your code, after some fixing it worked lovely, but for some reason, when i try to rotate more than 1 axis at a time the functions suffer horrible disforming xD
ill work on this a little more, thanks again for you example n_n
oh, and… im sorry if i wrote too much xd
see you later =3

First of all, let me tell you that I am glad to know that my articles and codes were useful to you.
The “disformation” may happen due to an error in the rotation formula (or matrix composition, if you are using matrices). Other probable cause can be the order of the transformations (rotation followed by translation may have a different result from translation followed by rotation).
Anyway, I would need to see your code to better help you.

here’s a visual example of whats happening with the points, i made this in a rush so, no back buffer = lots of flickering xD
also, i used a low dot density, that way it redraws fast even with a high refresh rate (Form_MouseMove) but it doesnt look like a solid object
the example its done with a function that creates half a sphere, that way you can see the rotation easily
well, here it is:http://www.megaupload.com/?d=0X2ZVIB3

Justt want to say yolur article is as astounding.
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keep up to date with forthcoming post. Thanks a million and please carry on the enjoyable work.

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Hi,
I have developed a app which rotates point on a graphics path but I seem to have an error when 3D rotating the points. It seems as if the “Z”axis in inverting (i.e. Z+ is Z- ) & then sometime it comes back. This look like when the axis is aligned with the view. Any Ideas why & how to correct it?

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